Just wanted to pass along that we tripped over a fix for a user that was receiving email but unable to send it. It had all of the appearances of the Send As issue caused by the MS Security patch, but none of the fixes worked. Ultimately our Email admin moved the users account from one Exchange server to another and it worked. Not sure if the send as was somehow corrupted (was showing as enable for the user), but wanted to pass this fix along in case anyone in a similar situation needed something to try.

um the only was this worked is that the other exchange server didnt have the microsoft security update applied to it thats why it worked.

or the fix was already implemented to that server.

there no way to hide from the "send as" being revoked if you applied the update on the exchange its gonna happen unless you grant the permission back.